diff --git a/cista/preview.py b/cista/preview.py
index fcaecb7..906c64a 100644
--- a/cista/preview.py
+++ b/cista/preview.py
@@ -128,7 +128,7 @@ def process_pdf(path, *, maxsize, maxzoom, quality, page_number=0):
     t_load_end = perf_counter()
 
     t_save_start = perf_counter()
-    ret = pix.pil_tobytes(format="avif", quality=quality, method=4)
+    ret = pix.pil_tobytes(format="avif", quality=quality, speed=10, max_threads=1)
     t_save_end = perf_counter()
 
     logger.info(